The application of entropy for detecting behavioral responses in Japanese medaka (Oryzias latipes) exposed to different toxicants

• DOI: 10.1002/tox.20589
• Publication Date: 2010-05-18T21:44:59Z
• Authors: Shinji Fukuda; Ik Joon Kang; Junya Moroishi; Ayumi Nakamura
• Keywords: Oryzias; Poecilia

Growing concern over environmental pollution by chemicals that may directly or indirectly impact human and ecosystem health make it increasingly necessary to establish a biological early warning system minimize these impacts. To achieve this, simple reliable approaches criteria for risk assessment must be developed. We propose new approach detecting behavioral responses toxicants in flowing water. conducted series of tests determine toxic Japanese medaka (Oryzias latipes) lethal concentrations potassium cyanide (KCN; 10 mg L(-1)) phenol (25 L(-1)). Fish movements were tracked three-dimensional (3D) biomonitoring under flow-through conditions. The 3D data used evaluate terms swimming speed, vertical position the water, entropies parameters. exposed KCN surfaced more frequently than unexposed fish, whereas fish stayed near bottom. Maximum speed significantly increased after exposure both test chemicals, median decreased exposure. Despite large variations behavior between individual could identified significant decrease entropy 10-30 min chemicals. conclude use can contribute development at stages pollution. present detect lower toxicants, further studies should using long-term monitoring sublethal concentrations.